List of by-elections to the Senedd

This is a list of by-elections to the Senedd (Welsh Parliament; Welsh: Senedd Cymru; formerly known as the National Assembly for Wales).

Assembly term By-electionDateIncumbentPartyWinnerPartyCauseRetained at next election
2016–2021 Alyn and Deeside 6 February 2018 Carl Sargeant Labour Jack Sargeant Labour Death (suicide)[1] Yes
2011–2016 Ynys Môn 1 August 2013 Ieuan Wyn Jones Plaid Cymru Rhun ap Iorwerth Plaid Cymru Resignation to lead the Menai Science Park Yes
2003–2007 Blaenau Gwent 29 June 2006 Peter Law* Labour Trish Law Independent Death (brain tumour) Yes
1999–2003 Swansea East 27 September 2001 Val Feld Labour Valerie Lloyd Labour Death (cancer) Yes

*Peter Law left the Labour Party and sat as an independent prior to his death. The by-election was won by his widow, but is classed as an independent gain from Labour.

See also